1&period; This down tube battery come with a charger2&period; Suggested to used for the motor under the 1000w3&period; Use 3&period;7V 3500mAh 18650 cell4&period; Charge and discharge over 800&lpar;70&percnt;&rpar; times5&period; Built-in BMS&comma;protect the battery to avoid overcharge and over discharge&period;